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Luminescent solar concentrator efficiency enhanced via nearly lossless propagation pathways
Luminescence solar concentrators are improved by using a laminated structure that creates a practically non-decaying optical ‘guard rail’ for light. Design rules enabled external quantum efficiencies as high as 45% for 450 nm light, yielding a device efficiency of 7.6%, probably useful for energy-harvesting windows.
- Kyoungwon Park
- , Jeongmin Yi
- & Chul Jong Han
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Article |
Dipole–dipole-interaction-assisted self-assembly of quantum dots for highly efficient light-emitting diodes
Dipole–dipole interactions in mixed-phase CdZnSeS quantum dots enable the effective orientation of the quantum dots and improved photon out-coupling when employed in a light emitting diode.
- Huaiyu Xu
- , Jiaojiao Song
- & Fengjia Fan
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Article |
Silver telluride colloidal quantum dot infrared photodetectors and image sensors
Silver telluride quantum dots are employed in shortwave-infrared photodetectors and in monolithically integrated imagers that are free from toxic heavy metals and fully solution processable.
- Yongjie Wang
- , Lucheng Peng
- & Gerasimos Konstantatos
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Article |
Mid-infrared cascade intraband electroluminescence with HgSe–CdSe core–shell colloidal quantum dots
Intraband electroluminescence (EL) from n-doped core–shell HgSe–CdSe colloidal quantum dots is observed around the wavelength of 5 µm. The measured EL quantum efficiency is 4.5% at the injection current of 2 A cm−2, benefiting from the cascade effect. The power efficiency is 0.05%.
- Xingyu Shen
- , Ananth Kamath
- & Philippe Guyot-Sionnest
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Article |
Unidirectional unpolarized luminescence emission via vortex excitation
The use of a nanopillar lattice and orbital angular momentum provides control over the directionality of light emission on the nanoscale.
- Jincheng Ni
- , Shengyun Ji
- & Cheng-Wei Qiu
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Article |
Near-infrared photon upconversion and solar synthesis using lead-free nanocrystals
Researchers use zinc-doped CuInSe2 nanocrystals as an alternative to lead chalcogenides for near-infrared upconversion. Upconversion to yellow with an external quantum efficiency reaching 16.7% is achieved, which can also be merged with photoredox catalysis for rapid solar synthesis.
- Wenfei Liang
- , Chengming Nie
- & Kaifeng Wu
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Article |
Extreme γ-ray radiation hardness and high scintillation yield in perovskite nanocrystals
It is shown that CsPbBr3 nanocrystals exhibit good radiation hardness for high γ-radiation doses, as high as 1 MGy. Electron trapping in surface defects limits scintillator applications, but is shown to be suppressed by surface fluorination treatment.
- Matteo L. Zaffalon
- , Francesca Cova
- & Sergio Brovelli
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Article
| Open Access
Integrated photodetectors for compact Fourier-transform waveguide spectrometers
A Fourier-transform waveguide spectrometer is demonstrated by using HgTe-quantum-dot-based photoconductors with a spectral response up to a wavelength of 2 μm. The spectral resolution is 50 cm–1. The total active spectrometer volume is below 100 μm × 100 μm × 100 μm.
- Matthias J. Grotevent
- , Sergii Yakunin
- & Ivan Shorubalko
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Letter |
Multiple exciton generation in tin–lead halide perovskite nanocrystals for photocurrent quantum efficiency enhancement
Researchers demonstrate low-threshold multiple exciton generation and photocurrent quantum efficiency exceeding 100% from high-energy photons in perovskite nanocrystals.
- Yifan Chen
- , Jun Yin
- & Mingjie Li
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Article |
High-efficiency photoemission from magnetically doped quantum dots driven by multi-step spin-exchange Auger ionization
Researchers show that up-conversion in manganese-doped CdSe colloidal quantum dots enables efficient electron photoemission. The effect is exploited for high-yield production of solvated electrons, demonstrating photochemistry applicability.
- Clément Livache
- , Whi Dong Kim
- & Victor I. Klimov
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Article |
Photon-number entanglement generated by sequential excitation of a two-level atom
A photon-number Bell state is generated from a quantum dot by controlling the light–matter entanglement during spontaneous emission. This excitation protocol can be scaled up by using N consecutive π-pulses to deliver multimode photonic entanglement.
- Stephen C. Wein
- , Juan C. Loredo
- & Carlos Antón-Solanas
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Article |
Ultrahigh-resolution quantum-dot light-emitting diodes
The demonstration of high-resolution quantum-dot light-emitting diodes by transfer printing could prove useful for next-generation displays.
- Tingtao Meng
- , Yueting Zheng
- & Lei Qian
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Article |
Cation disorder engineering yields AgBiS2 nanocrystals with enhanced optical absorption for efficient ultrathin solar cells
AgBiS2 nanocrystals with enhanced optical absorption yield efficient ultrathin solar cells.
- Yongjie Wang
- , Seán R. Kavanagh
- & Gerasimos Konstantatos
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Electroluminescence from nanocrystals above 2 µm
Near-infrared emission at around 2 µm is observed from HgTe nanocrystals. LEDs based on this material platform could prove to be a useful low-cost, convenient light source for applications in gas sensing and other tasks.
- Junling Qu
- , Mateusz Weis
- & Emmanuel Lhuillier
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Letter |
Solution-processed inorganic perovskite crystals as achromatic quarter-wave plates
Perovskite crystals of Cs4PbBr6 embedded with CsPbBr3 nanocrystals are shown to act as wideband, achromatic waveplates in the visible and near-infrared regions.
- Xiaomei Chen
- , Wen-gao Lu
- & Haizheng Zhong
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Letter |
Solution-processed PbS quantum dot infrared laser with room-temperature tunable emission in the optical telecommunications window
Solution-processed infrared lasers that operate at room temperature are a challenge, but now researchers have achieved such a device using colloidal quantum dots.
- G. L. Whitworth
- , M. Dalmases
- & G. Konstantatos
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Letter |
Giant enhancement of optical nonlinearity in two-dimensional materials by multiphoton-excitation resonance energy transfer from quantum dots
A simple coating of a sub-200-nm-thick quantum dot film on two-dimensional materials can drastically enhance their nonlinear optical responses through nonlinear-excitation resonance energy transfer by a high-efficiency remote dipole–dipole coupling.
- Hao Hong
- , Chunchun Wu
- & Jie Xiong
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Suppression of temperature quenching in perovskite nanocrystals for efficient and thermally stable light-emitting diodes
Fluoride-treated CsPbBr3 nanocrystals emit light with near unity efficiency at temperatures of up to 373 K.
- Mingming Liu
- , Qun Wan
- & Liang Li
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News & Views |
Untapping solar energy resources
The photovoltaics market has long been dominated by silicon, but further improvements of these solar cells require novel approaches. Now, triplet–triplet annihilation photon upconversion has been used to harvest photons from below the bandgap of silicon, extending the spectral response and potentially improving the efficiency of these cells.
- Bo Albinsson
- & Axel Olesund
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Photochemical upconversion of near-infrared light from below the silicon bandgap
Photochemical upconversion of light with photon energy below the silicon bandgap has remained elusive, but the feat has now been demonstrated using PbS semiconductor nanocrystals and violanthrone.
- Elham M. Gholizadeh
- , Shyamal K. K. Prasad
- & Timothy W. Schmidt
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Review Article |
Hybrid integrated quantum photonic circuits
The Review summarizes the progress of hybrid quantum photonics integration in terms of its important design considerations and fabrication approaches, and highlights some successful realizations of key physical resources for building integrated quantum devices, such as quantum teleporters, quantum repeaters and quantum simulators.
- Ali W. Elshaari
- , Wolfram Pernice
- & Val Zwiller
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News & Views |
Deep-blue carbon dots offer high colour purity
Carbon-dot-based light-emitting diodes with narrowband efficient emission in the deep blue are an attractive candidate for future high-colour-purity flat-panel display and lighting applications.
- Biao Zhao
- , Zhibin Wang
- & Zhan’ao Tan
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News & Views |
Quantum dots on demand
The ability to create and erase three-dimensional patterns of perovskite quantum dots in glass using a femtosecond laser could bring new opportunities in displays, security marking and data storage.
- Haizheng Zhong
- & Yongtian Wang
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Article |
Bright high-colour-purity deep-blue carbon dot light-emitting diodes via efficient edge amination
Deep-blue high-colour-purity light-emitting materials are developed by using amine-based edge passivation. The light-emitting diodes based on the carbon dots exhibit a maximum luminance of 5,240 cd m–2 and an external quantum efficiency of 4%.
- Fanglong Yuan
- , Ya-Kun Wang
- & Edward H. Sargent
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Letter |
Reversible 3D laser printing of perovskite quantum dots inside a transparent medium
Luminescent CsPbBr3 quantum dots can be written into glass using femtosecond laser pulses and thermal annealing, and erased by further femtosecond laser irradiation. The resulting quantum dot patterns could prove useful for data storage, decoration or security purposes.
- Xiongjian Huang
- , Qianyi Guo
- & Guoping Dong
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Article |
Dual-band infrared imaging using stacked colloidal quantum dot photodiodes
Colloidal quantum dot detectors, switchable between short-wave infrared and mid-wave infrared, are demonstrated.
- Xin Tang
- , Matthew M. Ackerman
- & Philippe Guyot-Sionnest
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News & Views |
Optical nanoscopy turns coherent
The ability to switch fluorophores on and off is key to performing super-resolution nanoscopy. To date, all switching schemes have been based on an incoherent response to the laser field. Now, a nanoscope that uses on–off coherent switching of quantum dots has been demonstrated.
- Thomas A. Klar
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Letter |
Far-field nanoscopy on a semiconductor quantum dot via a rapid-adiabatic-passage-based switch
A spatial resolution of 30 nm (=λ/31) exceeding the diffraction limit is achieved by super-resolution fluorescence microscopy. The nanoscopic imaging scheme can be applied to coherent quantum-mechanical systems such as quantum dots, as well as colour centres.
- Timo Kaldewey
- , Andreas V. Kuhlmann
- & Richard J. Warburton
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Tandem luminescent solar concentrators based on engineered quantum dots
Multijunctions have long been used to enhance photovoltaic solar cell efficiency. Here, a large-area tandem luminescent solar concentrator is demonstrated using two types of quantum dot with low reabsorption.
- Kaifeng Wu
- , Hongbo Li
- & Victor I. Klimov
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News & Views |
Lasing from dressed dots
A theoretical analysis of asymmetric dressed quantum dots in a photonic crystal cavity suggests that the system could form a new type of solid-state terahertz laser. However, an experimental realization will likely require advances in fabrication technology.
- Simone De Liberato
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Article |
Phonon scattering inhibits simultaneous near-unity efficiency and indistinguishability in semiconductor single-photon sources
The efficiency and indistinguishability of single-photon emission by a quantum dot optically coupled to a microcavity and to a waveguide are theoretically investigated. Owing to unavoidable phonon sideband, they can never reach 100% simultaneously.
- Jake Iles-Smith
- , Dara P. S. McCutcheon
- & Jesper Mørk
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Article |
Highly efficient luminescent solar concentrators based on earth-abundant indirect-bandgap silicon quantum dots
Reabsorption losses in luminescent solar concentrators can be avoided by the use of indirect-bandgap semiconductor nanostructures. The technology has been used to demonstrate flexible luminescent solar concentrators with performance comparable to flat concentrators.
- Francesco Meinardi
- , Samantha Ehrenberg
- & Sergio Brovelli
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Letter |
Electrically pumped continuous-wave III–V quantum dot lasers on silicon
The growth of III–V quantum dot lasers directly onto a silicon substrate aids photonics and electronics integration.
- Siming Chen
- , Wei Li
- & Huiyun Liu
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Letter |
Highly efficient quantum dot near-infrared light-emitting diodes
Embedding quantum dots in a perovskite matrix yields efficient light emitters.
- Xiwen Gong
- , Zhenyu Yang
- & Edward H. Sargent
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Review Article |
Lead sulphide nanocrystal photodetector technologies
Concepts and advances of lead sulphide nanocrystal-based photodetector technologies are reviewed.
- Rinku Saran
- & Richard J. Curry
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Letter |
Self-homodyne measurement of a dynamic Mollow triplet in the solid state
Intrinsic Fano interference in a strongly coupled quantum dot/photonic crystal cavity system is controlled to remove most of the coherently scattered light. This result leads to the first experimental observation of the dynamic Mollow triplet.
- Kevin A. Fischer
- , Kai Müller
- & Jelena Vučković
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Letter |
Solid-state infrared-to-visible upconversion sensitized by colloidal nanocrystals
Lead sulphide colloidal nanocrystals offer a solid-state answer for infrared-to-visible upconversion.
- Mengfei Wu
- , Daniel N. Congreve
- & Marc A. Baldo
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Letter |
Room-temperature lasing in a single nanowire with quantum dots
The room-temperature lasing of a single nanowire containing 50 quantum dots is demonstrated, paving the way towards ultrasmall lasers with extremely low power consumption for integrated photonic systems.
- Jun Tatebayashi
- , Satoshi Kako
- & Yasuhiko Arakawa
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Article |
High-efficiency light-emitting devices based on quantum dots with tailored nanostructures
Bright, efficient red, green and blue quantum-dot LEDs are realized by customizing the nanostructure of the quantum dots.
- Yixing Yang
- , Ying Zheng
- & Lei Qian
Turnkey locking of quantum-dot lasers directly grown on Si
Quantum phase modulator
Silicon integration
Fully tunable